rvm_tests/rvm_test5.c at master · sdseaton/rvm_tests · GitHub

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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "rvm.h"

/* proc1 writes some data, commits it, then exits */
void proc1() {
	rvm_t rvm;
	trans_t trans;
	char* segs[1];

	rvm = rvm_init("rvm_segments");
	rvm_destroy(rvm, "testseg");
	segs[0] = (char *) rvm_map(rvm, "testseg", 10000);

	trans = rvm_begin_trans(rvm, 1, (void **) segs);

	rvm_about_to_modify(trans, segs[0], 0, 100);
	sprintf(segs[0], "hello, world");

	rvm_about_to_modify(trans, segs[0], 1000, 100);
	sprintf(segs[0]+1000, "hello, world");

	rvm_abort_trans(trans);

	trans = rvm_begin_trans(rvm, 1, (void **) segs);

	rvm_about_to_modify(trans, segs[0], 0, 100);
	sprintf(segs[0], "hello, world");

	rvm_about_to_modify(trans, segs[0], 1000, 100);
	sprintf(segs[0]+1000, "hello, world");

	rvm_commit_trans(trans);

	abort();
}


/* proc2 opens the segments and reads from them */
void proc2() {
	char* segs[1];
	rvm_t rvm;

	rvm = rvm_init("rvm_segments");

	segs[0] = (char *) rvm_map(rvm, "testseg", 10000);
	if(strcmp(segs[0], "hello, world")) {
		fprintf(stderr,
		"A second process did not find what the first had written.\n");
		fprintf(stderr, "found %s\n", segs[0]);
    		exit(2);
  	}
  	if(strcmp(segs[0]+1000, "hello, world")) {
    		fprintf(stderr,
		"A second process did not find what the first had written.\n");
		fprintf(stderr, "found %s\n", segs[0]+1000);
    		exit(3);
  	}
}


int main(int argc, char **argv) {
	int pid;
	pid = fork();
 	if(pid < 0) {
		perror("fork");
		exit(2);
	}
	if(pid == 0) {
		proc1();
		exit(EXIT_SUCCESS);
	}

	waitpid(pid, NULL, 0);

	proc2();

	printf("Ok\n");

	return 0;
}